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Re: LF: FW: powered down from "4" to "2" on IC706mk2G due to interferenc

To: "[email protected]" <[email protected]>
Subject: Re: LF: FW: powered down from "4" to "2" on IC706mk2G due to interference with home routers es QRM from XYL es kids
From: Mal Hamilton <[email protected]>
Date: Wed, 13 Jan 2016 18:48:22 +0000
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
I have an ad844 available
Need to change 706 sine wave to sq wave to drive my Decca class D amp
Need 7v p-p 
also clean the sig up
Mal/g3kev

Sent from my iPhone

On 13 Jan 2016, at 18:16, Wolfgang Büscher <[email protected]> wrote:

> 
> 
> Am 12.01.2016 um 22:34 schrieb Mal       Hamilton:
>> Wolf
>> What is the comparater chip u use
>> to conv 706 sine wave to sq wave
>> Mal/g3kev
> an antique NE529 (in the *switching mode linear* as described on my website). 
> I only used it because it was in the junk box, but would not recommend them 
> for a new design if you had to order parts. The three supply voltages are a 
> plague, especially the negative 'analog' supply. Use a modern rail-to-rail 
> comparator with a few nanoseconds,  for example LT1016.
> 
> If I was to build such a PA again, I would now use a simple linear regulator 
> instead of the switching-mode DC modulator, since *most* of the time the 
> output amplitude is near 'full power' anyway.
> Or use a dsPIC to provide the control signals for the RF driver and the 
> modulator instead of the 'mass grave' of digital gates.
> 
> 73,
>   Wolf .
> 


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